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They cover M&M’s with shellac. It’s approved as a food additive by the FDA. It’s safe. That being said, it’s not the most durable for a crib. Any clear finish is safe, provided it has cured (which can take 30 days – or longer if you are curing it in an unheated garage north of the Mason-Dixon line). I would go with a poly if you have time enough to let it cure.